摘要
DP地区陆相侏罗系沙溪庙组砂岩气藏是典型的河道砂岩气藏,该层系存在窄河道、薄储层等特征,河道砂的含气预测是该地区甜点预测的难点。利用波吸收衰减、低频共振原理、频率衰减梯度、基于孔隙介质渐进方程、基于S变换5种地震含气性预测分析技术,结合地震不同的含气特征响应,在DP地区针对侏罗系沙溪庙组JS33-2的窄河道进行了对比分析。分析了各种含气预测方法对于窄河道储层隐含油气性的特点,认识了对于窄河道不同地震属性的含气预测方法的区别和联系,根据纵向薄互层和平面窄河道的特征,优选基于S变换方法进行纵向剖面薄储层含气预测,利用低频共振进行平面展布含气预测,利用两种属性方法互补性可以有效降低含气预测的风险,总体含气饱和度吻合率达到70%以上,支撑了窄河道砂体刻画和地球物理"甜点"预测,钻井成功率由72%提高到95%,高产井的命中率从65%提高到85%。
It is a typical channel sandstone gas reservoir of Shaximiao Formation of Jurassic in continental facies in DP area.Generally,it always hardly to give consideration to both longitudinal well profile analysis and plane distribution analysis in gas prediction with only a prediction method,because of the narrow channel,thin reservoir and heterogeneity characteristics of the formation.Gas prediction of channel sand is the difficulty of dessert prediction in this area.A variety of seismic gas prediction analysis techniques of wavelet absorption attenuation,low frequency resonance,frequency attenuation gradient,progressive equation of porous media,and S-transform was applied and analyzed based on the five methods in Shaximiao Formation of Jurassic in DP area with the different seismic of characteristic reservoirs response in narrow channel of JS33-2.A comparative analysis is made on the resolution of thin reservoir and the continuity of channel sandstone plane distribution.This paper analyses the various gas-bearing prediction methods for the underlying oil-gas information of narrow channel reservoirs,contrasted the differences and relations between the methods,and summarized the advantages,disadvantages,applicability and key points in the methods.The gas-bearing prediction of thin reservoirs mainly depends on the S-transform method with the highest resolution in the seismic profile,and the LFR method is selected to predict gas in plane distribution as the characteristic of continuity,surrounding rock and heterogeneity.It puts forward that gas-bearing prediction methods by using different seismic attributes can effectively reduce the risk of gas-bearing prediction based on reservoir thickness and plane distribution characteristics.The coincidence rate of gas-bearing prediction is more than 70%,which supports the sand body description of narrow channel and geophysical dessert prediction.The success rate of drilling increases from 72%to 95%,and the hit rate of high-yield wells increases from 65%to 85%.
作者
喻勤
许多
江莹莹
YU Qin;XU Duo;JIANG Ying-ying(Exploration&Production Research Institute,SWPB.,SINOPEC,ChengDu,618000)
出处
《内蒙古石油化工》
CAS
2019年第10期1-7,21,共8页
Inner Mongolia Petrochemical Industry
基金
国家科技重大专项课题《四川盆地致密碎屑岩“甜点”预测技术研究》(2016ZX05002-004)子专题《四川盆地致密碎屑岩“甜点”预测技术研究》(2016ZX05002-004-005)资助.
关键词
窄河道
河道砂岩
含气预测
小波吸收
低频共振
频率衰减
孔隙介质
S变换
Narrow Channel
Channel Sandstone
Gas Prediction
Wavelet Absorption
Low Frequency Resonance
Frequency Attenuation
Porous Medium
S-transform
